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Environmental fate & pathways

Phototransformation in air

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Reference
Endpoint:
phototransformation in air
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: The research was done at reputable laboratories and the results published in a peer reviewed journal
Qualifier:
no guideline available
Principles of method if other than guideline:
The products of Cl and OH radical initiated oxidation of trans-CF3CH=CHF were studied in a 700 Torr of N2/O2 diluent at 296 +/- 1K.
GLP compliance:
not specified
Light source:
other: fluorescent backlamps
% Degr.:
ca. 100
Sampling time:
2 wk

Hydroxyl radical initiated oxidation leads to the formation of CF3CHO and HC(O)F in yields which were indistinguishable from 100% and were not dependent on the O2 partial pressure. Chlorine atom initiated oxidation gives HC(O)F, CF3CHO, CF3C(O)Cl, and CF3C(O)CHFCl. The yields of CF3C(O)Cl and CF3C(O)CHFCl increased at the expense of HC(O)F and CF3CHO as the O2 partial pressure was increased over the range 5–700 Torr.


Long path length FTIR-smog chamber techniques were used to measure k(Cl + t-CF3CH=CHF) = (4.64 ± 0.59) x 10E-11cm3/molecule/sin, k(OH + t- CF3CH=CHF) = (9.25 ± 1.72)E-13cm3/molecule/sin, and k(O3 + t-CF3CH=CHF) = (2.81 ± 0.21)E-21 cm3/molecule/sin, 700 Torr of air diluent at 296 K. The atmospheric lifetime of t-CF3CH=CHF is determined by its reaction with OH and is approximately two weeks. t-CF3CH=CHF has an integrated IR absorption cross section (650–2000 cm-1) of (1.94 ± 0.10)E-16 cm/molecule and a global warming potential of approximately 6 (100-year time horizon). As part of this work the reaction of ozone with C2H4 was determined to proceed with a rate constant of (1.46 ± 0.13)E-18 cm3 /molecule/sin 700 Torr of air at 296 K.

Conclusions:
HFO-1234ze is removed by its reaction with OH in the air in 2 weeks. The atmospheric decomposition of HFO-1234ze is expected to have negligible environmental impact. The half-life of the test substance was not reported.
Executive summary:

Hydroxyl radical initiated oxidation leads to the formation of CF3CHO and HC(O)F in yields which were indistinguishable from 100% and were not dependent on the O2 partial pressure. Chlorine atom initiated oxidation gives HC(O)F, CF3CHO, CF3C(O)Cl, and CF3C(O)CHFCl. The yields of CF3C(O)Cl and CF3C(O)CHFCl increased at the expense of HC(O)F and CF3CHO as the O2 partial pressure was increased over the range 5–700 Torr.


Long path length FTIR-smog chamber techniques were used to measure k(Cl + t-CF3CH=CHF) = (4.64 ± 0.59) x 10E-11cm3/molecule/sin, k(OH + t- CF3CH=CHF) = (9.25 ± 1.72)E-13cm3/molecule/sin, and k(O3 + t-CF3CH=CHF) = (2.81 ± 0.21)E-21 cm3/molecule/sin, 700 Torr of air diluent at 296 K. t-CF3CH=CHF has an integrated IR absorption cross section (650–2000/cm) of (1.94 ± 0.10)E-16 cm/molecule and a global warming potential of approximately 6 (100-year time horizon). As part of this work, the reaction of ozone with C2H4 was determined to proceed with a rate constant of (1.46 ± 0.13)E-18 cm3/molecule/sin 700 Torr of air at 296 K. The atmospheric lifetime of t-CF3CH=CHF is determined by its reaction with OH and is approximately two weeks. It is concluded that the atmospheric decomposition of HFO-1234ze is expected to have negligible environmental impact. The half life of the test substance was not reported.

Description of key information

One publication on phototransformation in air was available and included here as a supporting study.


HFO-1234ze is removed by its reaction with OH in the air in 2 weeks. The atmospheric decomposition of HFO-1234ze is expected to have negligible environmental impact. The half-life of the test substance was not reported.


 

Key value for chemical safety assessment

Additional information

Hydroxyl radical initiated oxidation leads to the formation of CF3CHO and HC(O)F in yields which were indistinguishable from 100% and were not dependent on the O2 partial pressure. Chlorine atom initiated oxidation gives HC(O)F, CF3CHO, CF3C(O)Cl, and CF3C(O)CHFCl. The yields of CF3C(O)Cl and CF3C(O)CHFCl increased at the expense of HC(O)F and CF3CHO as the O2 partial pressure was increased over the range 5–700 Torr.


Long path length FTIR-smog chamber techniques were used to measure k(Cl + t-CF3CH=CHF) = (4.64 ± 0.59) x 10E-11cm3/molecule/sin, k(OH + t- CF3CH=CHF) = (9.25 ± 1.72)E-13cm3/molecule/sin, and k(O3 + t-CF3CH=CHF) = (2.81 ± 0.21)E-21 cm3/molecule/sin, 700 Torr of air diluent at 296 K. t-CF3CH=CHF has an integrated IR absorption cross section (650–2000/cm) of (1.94 ± 0.10)E-16 cm/molecule and a global warming potential of approximately 6 (100-year time horizon). As part of this work, the reaction of ozone with C2H4 was determined to proceed with a rate constant of (1.46 ± 0.13)E-18 cm3/molecule/sin 700 Torr of air at 296 K. The atmospheric lifetime of t-CF3CH=CHF is determined by its reaction with OH and is approximately two weeks. It is concluded that the atmospheric decomposition of HFO-1234ze will have negligible environmental impact. The half life of the test substance was not reported.